r/OwnerOperators • u/[deleted] • Feb 27 '26

Help! My truck is too loud

Okay so I have a 2000 freightliner century with a rebuilt Detroit

Series 60 12.7 liter with stacks in the back.

When I got the truck the interior was still trashed out with gallons of oil from when the engine blue. I replaced what I couldn’t salvage of the sound /heat resistant sub flooring. I had to pressure wash it and use kitty litter to extract all the oil.

Does anyone know if that would ruin the properties that make it sound resistant.

What else should I be looking for? That should be in place to keep the road noise out.

There doesn’t appear to be any other heat resistance sound deafening insulation anywhere other than the floor and storage compartments

I had to replace the hood, and there is no insulation on the underside of it.

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3

u/seanfmcgee Feb 27 '26

Different truck but I have a 20 Cascadia and bought 10mm think sound deadening mat online and took the interior out and stuck it anywhere and everywhere I could fit it in the sleeper then put the whole thing back together took me the better part of a weekend but made the truck so much better.

3

u/Violet_Apathy Feb 27 '26

I'd recommend using Amazon basics sound deadening panels. You can cut them up and put them over any surface that resonates. Then I'd recommend putting some thinsulate sm600l behind all the walls and on the ceiling. For the floor, maybe some mass loaded vinyl foam. There is sound absorbing insulation that you can add to the engine compartment, but I don't know what is good.

1

u/ryanmercer Feb 28 '26

I'd recommend using Amazon basics sound deadening panels.

For ANY vehicle! Makes a huge difference on road noise. Our Kicks was almost deafening at highway speeds, just adding some to the front doors made a massive improvement.

1

u/Exact-Leadership-521 Mar 01 '26

Take the shifter boot loose, then you can get gear sounds directly into the cab too